N = int(input())
M1 = int(input())
A = list(map(int, input().split()))
M2 = int(input())
B = list(map(int, input().split()))

s = set()

a = 0
for i in range(M1):
    a += A[i]
    s.add(a)

for i in range(M2):
    a -= B[i]
    s.add(a)

# print(s)
print(N - len(s) + 1)